class BooleanOperator

Current.php in drupal/core/modules/user/lib/Drupal/user/Plugin/views/filter/Current.php

Definition of views_handler_filter_user_current.

class BooleanOperator extends FilterPluginBase {

  // exposed filter options
  var $always_multiple = TRUE;

  // Don't display empty space where the operator would be.
  var $no_operator = TRUE;

  // Whether to accept NULL as a false value or not
  var $accept_null = FALSE;

  /**
   * Overrides \Drupal\views\Plugin\views\filter\FilterPluginBase::init().
   */
  public function init(ViewExecutable $view, DisplayPluginBase $display, array &$options = NULL) {
    parent::init($view, $display, $options);
    $this->value_value = t('True');
    if (isset($this->definition['label'])) {
      $this->value_value = $this->definition['label'];
    }
    if (isset($this->definition['accept null'])) {
      $this->accept_null = (bool) $this->definition['accept null'];
    }
    elseif (isset($this->definition['accept_null'])) {
      $this->accept_null = (bool) $this->definition['accept_null'];
    }
    $this->value_options = NULL;
  }

  /**
   * Return the possible options for this filter.
   *
   * Child classes should override this function to set the possible values
   * for the filter.  Since this is a boolean filter, the array should have
   * two possible keys: 1 for "True" and 0 for "False", although the labels
   * can be whatever makes sense for the filter.  These values are used for
   * configuring the filter, when the filter is exposed, and in the admin
   * summary of the filter.  Normally, this should be static data, but if it's
   * dynamic for some reason, child classes should use a guard to reduce
   * database hits as much as possible.
   */
  public function getValueOptions() {
    if (isset($this->definition['type'])) {
      if ($this->definition['type'] == 'yes-no') {
        $this->value_options = array(
          1 => t('Yes'),
          0 => t('No'),
        );
      }
      if ($this->definition['type'] == 'on-off') {
        $this->value_options = array(
          1 => t('On'),
          0 => t('Off'),
        );
      }
      if ($this->definition['type'] == 'enabled-disabled') {
        $this->value_options = array(
          1 => t('Enabled'),
          0 => t('Disabled'),
        );
      }
    }

    // Provide a fallback if the above didn't set anything.
    if (!isset($this->value_options)) {
      $this->value_options = array(
        1 => t('True'),
        0 => t('False'),
      );
    }
  }
  protected function defineOptions() {
    $options = parent::defineOptions();
    $options['value']['default'] = FALSE;
    return $options;
  }
  protected function operatorForm(&$form, &$form_state) {
    $form['operator'] = array();
  }
  protected function valueForm(&$form, &$form_state) {
    if (empty($this->value_options)) {

      // Initialize the array of possible values for this filter.
      $this
        ->getValueOptions();
    }
    if (!empty($form_state['exposed'])) {

      // Exposed filter: use a select box to save space.
      $filter_form_type = 'select';
    }
    else {

      // Configuring a filter: use radios for clarity.
      $filter_form_type = 'radios';
    }
    $form['value'] = array(
      '#type' => $filter_form_type,
      '#title' => $this->value_value,
      '#options' => $this->value_options,
      '#default_value' => $this->value,
    );
    if (!empty($this->options['exposed'])) {
      $identifier = $this->options['expose']['identifier'];
      if (!empty($form_state['exposed']) && !isset($form_state['input'][$identifier])) {
        $form_state['input'][$identifier] = $this->value;
      }

      // If we're configuring an exposed filter, add an <Any> option.
      if (empty($form_state['exposed']) || empty($this->options['expose']['required'])) {
        $any_label = config('views.settings')
          ->get('ui.exposed_filter_any_label') == 'old_any' ? '<Any>' : t('- Any -');
        if ($form['value']['#type'] != 'select') {
          $any_label = check_plain($any_label);
        }
        $form['value']['#options'] = array(
          'All' => $any_label,
        ) + $form['value']['#options'];
      }
    }
  }
  protected function valueValidate($form, &$form_state) {
    if ($form_state['values']['options']['value'] == 'All' && !empty($form_state['values']['options']['expose']['required'])) {
      form_set_error('value', t('You must select a value unless this is an non-required exposed filter.'));
    }
  }
  public function adminSummary() {
    if ($this
      ->isAGroup()) {
      return t('grouped');
    }
    if (!empty($this->options['exposed'])) {
      return t('exposed');
    }
    if (empty($this->value_options)) {
      $this
        ->getValueOptions();
    }

    // Now that we have the valid options for this filter, just return the
    // human-readable label based on the current value.  The value_options
    // array is keyed with either 0 or 1, so if the current value is not
    // empty, use the label for 1, and if it's empty, use the label for 0.
    return $this->value_options[!empty($this->value)];
  }
  public function defaultExposeOptions() {
    parent::defaultExposeOptions();
    $this->options['expose']['operator_id'] = '';
    $this->options['expose']['label'] = $this->value_value;
    $this->options['expose']['required'] = TRUE;
  }
  public function query() {
    $this
      ->ensureMyTable();
    $field = "{$this->tableAlias}.{$this->realField}";
    if (empty($this->value)) {
      if ($this->accept_null) {
        $or = db_or()
          ->condition($field, 0, '=')
          ->condition($field, NULL, 'IS NULL');
        $this->query
          ->addWhere($this->options['group'], $or);
      }
      else {
        $this->query
          ->addWhere($this->options['group'], $field, 0, '=');
      }
    }
    else {
      if (!empty($this->definition['use_equal'])) {
        $this->query
          ->addWhere($this->options['group'], $field, 1, '=');
      }
      else {
        $this->query
          ->addWhere($this->options['group'], $field, 0, '<>');
      }
    }
  }

}